<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
      [v-cloak] {
        display: none;
      }
    </style>
</head>

<body>
    <div id="app">
        <h2>{{msg}}</h2>
        <h2 v-cloak>{{msg}}</h2>
    </div>
</body>
<script src='../js/vue.js'></script>
<script>
    setTimeout(() => {
        let app = new Vue({
            el: '#app',
            data: {
                msg: 'hello vue.js'
            },
            methods: {}
        })
    } ,1000)
</script>

</html>